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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2740718b7cc138b70a386a904952afba460beec6898e7e73a9d03787e662a910' 
  AND token = '1q9fzzKcG9EJzlB87pP6FU2YWbboJ7FL0T2JWMDKq8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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