Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb2da4d800fe02e0df3ca9f120e74fddd80c5350ae1a9a006e139df974e29d5' 
  AND token = 'AtBD5TBGB5v+ZO2lBZK32h5C/S/uwYenFXGgYAqQOac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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