Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c20d409b5403f556dfc5229e541b6c61feb759dda990502854c451217f36b27' 
  AND token = '4zZ/m4hE+K0FHLV78ry63U5tFiwmTkMM6v5ISq36khQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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