Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4c0c6c4bf8a59f8d3b115c5e7841d31865e2f774f5a6f172c8658ea4a8f6a0' 
  AND token = 'lcTduHpmAfLs1jYEHSJ3czVzFdLj3UFC7XsuDZrO8RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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