Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a549ffe11150d0cab05c651ccb03698e0101336dc87f1638ce5da657c6dff3' 
  AND token = 'teQOoRk5yBa16r9pEjs0liD8wrqzbNVXMCmzrWNCTJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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