Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad74c45b337728721633256a83bae584e963f8fb7fbdb3c14e4e3d7b5a447e81' 
  AND token = '6nC2VxMTqcxG+XiTaD0P7pd1YB91mJTyjmg5yP8TGzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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