Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c993d40de8536a0bc522b2f3a90ed3ed357f749472048a32525df44ddc9b49b4' 
  AND token = 'zg1F6ktFWzh2f1gDFLLEEorxyCCGkj4EwPXx2/sySWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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