Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61207ae8a8f30f7f144dbc2ae8a28bc5f4f9e37e04ac3f0c3d136992461afc16' 
  AND token = '7NG+MNdZj26Ar9tlByRG/w4LdnsAGxRx7Zl55rM7Fsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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