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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24d4532dae3070ce3d581b8f6f8c2d664a120e48dec02460fca13e347216fbdc' 
  AND token = 'w9Ydu8ghPJtTOYhKy1PrzNxmldeBh82072reekl0eBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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