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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a6a57a7d26f4146f0e429eb9d8e976bee5b9ecad651cc30b5d66f6909a9e15e' 
  AND token = 'JB1jED2wDWs5Kkrau9R8J9OOSCuaxdUiFdlrDrjjWeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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