Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a3b8be5eb3be31c1c107947b8d0c5507d5477d5b735871137d66bc39f381ee' 
  AND token = '+EKfFoXd5tZhBJk71bTQZwsqW6SqFraQObXh0ay165w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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