Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4b1fbcbd54706db8965168cf4d766b6ccf9ca84b550679a19aa2d48bae2097' 
  AND token = 'VTOXEuASWqIiA5Vl9wFXElWSfntACSeBZM2FpjssBiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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