Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75309fb2cc7e48eb8ccb5569b42e5b829b2739861b1df899a9604c4ee1f991a1' 
  AND token = 'X5dzUSURD6YqiP5r8n/c4fb/hEeGxQOvFfKnD+m19Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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