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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb99b5d0d7999d0b53eb373f9f45803e850d7445ad39617235794148170fa36d' 
  AND token = '6OKiCZR+TU4IqByufdufLWEaKxJFxWkXKF2dtIr4QRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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