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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03bcaf339376bc06fbce16a54d342b11dc2785ae0003d6c3c0631e574878371f' 
  AND token = 'ahUTpqWmq0ssENQ0wEBHO8LvoyWUJlUHtWrts6HW4Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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