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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71d7c7235d2860bc0584f01d50a9f36303d6ef7edfbf593fba5bb4d7e9cf6f0b' 
  AND token = 'Wzi6Fn1+kPtM92zlkc4ZVq7lh53elwxv+n4Ta252i7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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