Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e592566cdabca356881591cf1e9f8fd1e4b3c9c2dff11fcf1d679496e16c01b' 
  AND token = 't1hO0cwZxvC+LiP4vmblFgvTmCGHOk+iXSCL9Ha0Jdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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