Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d971d7ca70c90db02973c1d0087d4af85e143d0fd52a05379c64d2c8eb1a73' 
  AND token = 'yC2reMySS4v6VO/yNmiwA4OZ5f3dSBRTUmQbUVb0pUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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