Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe7c2282e12865efe2822f15a75039014d963a8247be26a1fc3e537dd7577bd' 
  AND token = '87JzclGp1g5HC5br/Io+oPc7A/wj6mAVB2fDi9kHavc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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