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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63af96c3d88549dcf9c1d46b9008c7ab5782db672b91e5b9e20b752d0870e783' 
  AND token = 'mCWAZgSqIlGog6BTxeXk7Lzs06uGexnyGmoG4a2CAC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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