Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f0bccf98dcb710e38ea4cf5c2016bc1b2b177414ab23cd0a1430bdcc6890cb' 
  AND token = 'W+djfcjtnZVpEIKr0cRabfU+sl/3fyercCs78J1Krrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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