Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42bde0e769e19e64dc6ef86cc1aeb6057f18d1502868f575e484f3b4b465d3b' 
  AND token = 'RkDi6sGAhJ8RazX/HURZ2Y+/XtbAgUbZmXMam1yRnL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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