Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f52838914a00257f0863063183875e9b9c4bf1d482c4ceda2cf7b7e94c91e11' 
  AND token = 'g2Cm9gNLb2rvMKzIrMtZ0tY4yL9NwEbFuD9cxWpmFNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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