Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6292c44f27ac9ac3125c2ebbe4ed0c9a88d52354a8ada28b2029e5962c4d7fc4' 
  AND token = 'ETi3RmbAnPUNFZPkPC/JclExWewRN9Eky0SR1J/Az3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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