Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3cd11d2b32710b039fca44651b318b7d577c45db66ef8af9b7c1c18c398c71' 
  AND token = '7d5oSYCCZUB5tM2UPHfSJ0K6CJ78IVIi2c1ZDp3ciAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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