Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaec4235b29f6cadd57da1990d3763ecadc2f29a8ddaf8e9f2e0e44d2e7af15' 
  AND token = 'jomSoUOopR/u3IS9qc7aYEnMSJpnyb/Mt+EqriIZNlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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