Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9ad8f76f0a5f64ee03dbfdce62e7ca6eebeaff95d51dfa826d0e506dc1b966' 
  AND token = 'Ln6J/hxAs73Z50wBXUJE/nzkIwZo+x1m0UJHydM2hPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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