Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7dd71fcfce759b162c918b69b30ed2cddb6aa08d30f8090bffd9f8bb3052e3' 
  AND token = 'p2kwKcVBnu5GztdAZrU4c5bZQAp5PfwZJ3vNe7H3t5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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