Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5343ef2fdc5e1cbe87103fee5a0ca59319478618c6055cea09d9ea2090f0f29b' 
  AND token = 'hLNWryXB3K4zrg9+iD/JxtWmAc25TluCZzUhFTh7NpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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