Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b1c00d099e3cc2f950ab56c5d8ef39d81b7dec92b41125d365ae84283b1a98' 
  AND token = 'N6Sh5f6yEwX6jhG3Zg7oO5KGHzdYN3negNRbwbT2VQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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