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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cedbf824288e5a05fb163ea031450e4db6f1923abd324237004ba2366db93dc8' 
  AND token = 'H1JakXNOGxNGYWAkJ29Q0GabcsPHRzN3wovIBnQQQDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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