Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebeced13d211535aef3d31153a5207cc40ef9294f6f281d85076941d1f1da5ca' 
  AND token = 's080vg8c9qzQsMKMUVaEzZQ6BQmPhp5rHHMst6X5is8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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