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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1409b1880d8dacc60f34b3cd5e0b5bf3d67888b45d1fd6e611d92de6549eaabb' 
  AND token = '5021eH4RU/hUHp1UYcsy64fdytTT7SutT3a9rJXQYf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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