Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df4b451b43ec2c82a3eb82d1b67f6cbdff1e5c0b560640fc9a65885d2c86d8c' 
  AND token = 'fbDYw/GCm+rDJpr0i68x7aST2eK29A3ycxlZEsEm/V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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