Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d51398e2c7a7e43960f3dfc76c35d8be977cd60e1c14c5edefabdf57f908ab' 
  AND token = 'b+/hotRhx1hN+skNX2i/Q5BHIoHzKwCdIjZ3rOdLrvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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