Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5853c7a84a3227d3e37da2b924d93e0f38810729ab8a3dcd5107f6324ee684f' 
  AND token = 'qfng2tSzhcc44sxxt3cOtwzTl8pjE/9QKSMNR10VVms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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