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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fdd423f982d694489a18f838f2dd190b2ed47c7e6fe7c7653032cb7e9ea54461' 
  AND token = 'aMFF9hZwu50xzwjesGwNwTyd6Wq+ADl500didXfw+PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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