Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7002cc30e30d2d1c74d96ec7040820aeb49dcc18b6a0fc241ba8458c9a3a91' 
  AND token = 'SeQAScIygKiC7kdYbnDBMDqwietmNESKnu4Hcw8GVmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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