Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b0e16968c9678841f51fbd7dbd73726e5fd9f4a4226ea051e016be31281ea3' 
  AND token = 'CWzWoD3vwtAlVVI4BfXDSAXfKV5VHHkBrjb6W/u+dEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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