Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc52eab7b0bec7043635bb013dccb2d4e234c0b606521bab1e6c78648730f484' 
  AND token = 'BLnFbM4y8MtRvodcpWI0XNwgFVidk/CJVYltNgrXEcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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