Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7772cb9961b2615f575b3e0791907321412d2dfbedba4e6ee28794668ff497' 
  AND token = 'AJyNNQeuvdIMjOHjOm3qQuIkuDNrlr9rshttS+ReYqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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