Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252e3125f64a0d3550f1b3759a0244f674c8afb38a0cb00b3ed1c8b52dddd566' 
  AND token = 'PyvQXLh+gUuAVXen5V///S09djcLV8yCbFvnRLfMoU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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