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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '881df7d7855ed8fae1d11a918f095051e081eb05a4de10619ea60a56aabefb77' 
  AND token = 'Ui3ISGe59MCdzfTSulFpWYsJbL/NQAgCR92A/m6RjG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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