Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a722c3cc3748aa8970b1ec23f212d89923ac73e98b1adda7a23a005f4576d8' 
  AND token = '+tPUcjxH9+nAnLzL08FKWfpOpDpdRoTgqycS5vHuS8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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