Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d5e528132a13ac40c96684a571ec62c8bd95640adc35a91c9b0ebce9b6eb0b' 
  AND token = 'C6nSMnrp1v1rfh33LAZrlGf1PPUP7IpZrlVIRYc/6AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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