Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c08856b6f1feec98abd35235d3804afefe30692fe259566991ba86c6a2da60' 
  AND token = 'JaOAWfw3gaF+mlrdwEvvN6Lmv5GJYpsYDjUlPW38R/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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