Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb90ec2b04aeb23ac7a3a61534c0c963928e3980f06d71def0af6e2b0d1d0a8' 
  AND token = 'pzTm2vVHAmNa1v9vgVbtdQ1Rtw8cnipwXDo0kXSmyu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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