Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875afa4f4700d0ce8753395f3e1e56dac48675ff7c1d42e41dd50ab48e1095ce' 
  AND token = '+MWvvogFwvyGuoq0EF8EoXHta/IJYfmJXQp3ujRLUm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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