Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca61e450bff5435383ec9138ae3275be3a82f0e6b43ced460118ea4cb32b06' 
  AND token = 'PLjygayXPf9s+iqJrZhp1ehitbTsDB6Zdvc1UQrlzAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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