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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db79473f1a929befaf6dda595572a98651c6e63ba49bb3c9c875d0704064b0cd' 
  AND token = 'HkuUOx92FWZgWpOgelNvyTdX4Bp1FEOtyxi48fZTYL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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