Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da4239bf4da8ca2b5de3e1ca540ebf34237aadf7e906f9b2653cac52c5f1d14' 
  AND token = 's9V7cB+yiv2iXyscHNoGpANaN5KFWraXBXs/anKGPYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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