SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f005b3d7b32582bc67439ac4939c42c9b7da4c6421c29370af68063eb593d75' 
  AND token = 'JBYLaBMkEaJbWGxqoxD4VULjunGTSxMCw0isOrY88UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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