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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08d9240d534e6ad8dfdd6e4f0708ac18d42de3813302c0fe50d0d95017b9cd6e' 
  AND token = 'o9pvv3YK4EOjDkFXB339n+4gCx5u3hlSglBerHSI2pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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