Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c9ae6c7d3fa904f3512880da9ff1f8572f47d9a8f6be973408147e66e22f0d' 
  AND token = 'rEnh3jGWujPOu1XacF/q+qGhiHfGintARlAm5iVEr8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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