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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'efdc57a2108636bd1ef5ffe051753e393419fecf5b12962eeeb3a7e97aa26afb' 
  AND token = 'sSFkoMvvr5U9YWKs6OhGHcWKGdOLi5G5mkHkBU1jL9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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