Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec70f4aaf7ecdcbd93fe7d6c9ba313bd06bf351484cbfe5b5186d6da1c81e42a' 
  AND token = 'aEdob4q/xH/jWg99RjO0WSU4riNGOtNcoeaOvdvizgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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