Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5251896f37d1263bdb654ce1b531974b1397179295e067b446e06a6f67d68172' 
  AND token = 'PR+eOOEwldWXFTGaFOS3OJPH8WcMvyE/m4stEAKk6og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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