Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0a8e6dbe54097e11d1a0befe9e3f503a96a6863ce3a355d5530e119a37e4ed' 
  AND token = 'PZKenCFdVtYpI3ZexcQj1IPFQoWGx3uIgTCHag7qUtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}