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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c422ac8df00b35a211946df925ec128203dfd2c05a71ded3c6de61e316f1fde3' 
  AND token = '84K4dPsEBCbfAYj/Q+8pUrgOLbbR73xE8FDB4ILllBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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