Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2b1c06cee5f5a8b0111eaea808335f09f3d70ae0c6140ccb68fa77f5ea7045' 
  AND token = 'zZc52Z9eKKAuR2rD4LtjD9EjA7pzQMVom++I0gRPEFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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