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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8dff4cedf65797f1dee8c41acd144096f6a34dde5852c31687f0d8d02d43915a' 
  AND token = 'NNfTFH8KlLmhS2EMGBGUgHjZSZ4eHD5JMaoWBeaBEWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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