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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '624e30f4d850ff25efb97a3614f61493fbec106fc74c15f700b16c471a7a0760' 
  AND token = 'fO0hopfkFkiTouBeKviV8ZLapym9qb5QRkATJTXkkjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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