Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a7538f8a51ea4174190e4ecf09a4b0fd3a3458895d3c905901dd78bd2fffea' 
  AND token = '+B/ISLafJ8iCpiOi0LuJgMTEd+mzOUDUiu0VLUYvcOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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