SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e06ab0662ccb98fa21005fd8b31dab22095d51f8207f30bcf09cbed249c8e45b' 
  AND token = 'IP6Vj4Mo6TMZTfDevz7QG2qoWetgwK3C/wSQ2Qy+8bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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