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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06f55c7cbb9da35a6627b5f2f7882d95955a8fc181adda23fde382772bafb4c7' 
  AND token = 'zd5wvWyIjNjklM5RQ1l9VUYz3sruILDJM5ED+sfzx4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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