Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e6ee0c8756aa1c4e609e4626db535233fd44ebacabf9af5086e009b45ca803' 
  AND token = 'UXcE05Af8K/Wap6kyFC0n/LCMbUwRyLnLb40DSJ8fDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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