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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2964ff191f4fd1c2e67cd6a6231c5b3ba1e8652f4362e0325b833afcaa99209' 
  AND token = 'n627XRCtvo3keE5GhN1mlBMahh2GNvzQIn2fQBqWfpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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