Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea76227241bda0a5f21689cb57001890d6e9a778e1f0882a57dae31a683e3d93' 
  AND token = 'MnbB4NqezUxgQ5NIAASl//fGQ5Mi171CxiveERAM150=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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