Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8743090b92805594d6441940b456e5ab3afdafa06985d540e4c5cf2fc8e8c33' 
  AND token = 't7NXw+g6af772Az1leMIYElPXu2PjkzF2U7lEidyAMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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