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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9aa32be2d778c47eb7c79c50561d22b31325462712f72ec0b020f5ffe2b899ca' 
  AND token = 'lh62KyRBxkcNRP6RGxEWvBD9XNAH0PKg/ipDJtbFC2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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