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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd56d0760264420de67c9a71bc2b5cd401a7563dee4d853561c9d1df4fd23ff4' 
  AND token = 'VPTngs3weHYGUlrRatU0znIXO6w6pv0XxanhFEuLptY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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