Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fe3e2877a1ddf7a1099a57c61480fb1a2139957c73b2f438de464b6fb276ee' 
  AND token = '3c7xDwOkdwn3XIc4tA6UYtZSlW3x6jLVGfF+W6qws4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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