Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e6b838e7bdf9db0571caccabe77186c0683fbd774d3fe6d16bd154a23fc4ac' 
  AND token = 'P8Z5PMDr3Sa7BoxOBLuLpbJAmUCBIlDH8kTO0eTBIJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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