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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '954e4d47da4ea670a5bd864fe7b00c0cb99fe8d06205d040515f72497ce3b702' 
  AND token = 'Jon1VHL8WqAiWX2G7e//ow+JxKjC+8ovVrbx9ltVlx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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