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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7db36c105b87c0825a491601f4336bf214866f41c777242c0a5e09dcd5fddf4e' 
  AND token = 'jsmaDDFJ8ZPdeO8Cd43gBIJyiGkm2rh4f5bBloThCEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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