Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060f200934594b24f02cef21b37546d3ab3741a958d167e80e3837d04b1df3ba' 
  AND token = 'd6ONdMy/mzrTjAeGeESsxGFA2lmhjGMVSVnC2ba+AC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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