Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a727c03ac26ab2ccefd8e20ac474a026ace710dddaa7999a6d3d3d888297d8e5' 
  AND token = '8KBBWhB9bpE6W7PI+0v0caQdo+vebazj6e5b/GaiQvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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