Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0069ff5bf7c0d2060f284cb63ff4b6953ffe8446198b1c6ddc1b47513699000' 
  AND token = 'ljeTb6T/5OswEmJwV6i4/A4VeO2UKbKiSkTNqEVG2DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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