Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263519682bdfd1364f28a1d4a3757bf71c348ac8fcfc71534f14f6271f83a6b7' 
  AND token = '4lx0Hznzr93bZBJGYI/kLMhTEr42rc7uaHJI7f9d3Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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