SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ed9ee1ef34e45239cd7e5cd602fb4b0d2832ae70bf6eaebd265f5c54af99a2b' 
  AND token = 'FWN+nUG7hkIwFhgWPr1+SXtdg0YrDRlDpkmOz8AXm3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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