SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72ae9415e7eef32be6cadb4c166e4af781f155d60dbc69a1f0f41c3f9ab00264' 
  AND token = 'iMilJYqyIdqB9k+udAZNW8Gi7VMtnK2qYDGKTqEgffE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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