Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10125bec0ad94592ff48346cd368e7057605129b6de6e67597266745e1ee43ca' 
  AND token = 'dW1TurCQAZ4KzgylKMr6NuZsr00MwZzSOvwfSb+0xmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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