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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4863d72d58f987cb5a0b153d4cec64e917258991b12312e32217d2fa7388daaa' 
  AND token = 'aGw2ODizXAY8Whdqz5kj27rnbIvuEARVB1EhjqkFdNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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