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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3c50a219b111b9a3fc6d700278c867d532821fa00a9ce14fbb7f8719414444c0' 
  AND token = 'W8PWhCHpx/S/w6fWWA0Ras6Vc0ZhbinbgDdXq6Ulc4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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