Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c87933ce883783556a2f20343b72488867a3311ec81f770d8b3216e1ede496' 
  AND token = 'eNu6+qdYK1SsZkwTM4hVL/9idQTtQbCvfqrLAEscPAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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