Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6c50f3a5b22c3907d0c685af52ab2b76d3f667b968588d4f747bbafc3c2e26' 
  AND token = 'obWV7/1krACFsBmJUkU/n28J/fjG7sygx6qD1Xg86z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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