Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df6b58e20201e76c1fc3702ceedfcb2e4d9c442a1f8ef5e0c2ab698cda05c74' 
  AND token = 'nju0aLW8s94PJ8GFjhkQ8d5EGv6M8a8dkiqeLMpGWzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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