Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c278e3e2a199a82fc3a7d5f15accbabef355b542405b452170e4f6a1622ad0d' 
  AND token = 'hwq0ZEMTd6FpOp/rl4v1nlDRe5X6ZOHH9a3g5XkzbzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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