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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c95febae34805bad0b198792cc2952910f39876f7fb1a74d19d6c7ae98e4a88' 
  AND token = '9aVbvh6ZDgOrxTbPSDY8WdpRDRQFiAWP+n7QCl7433Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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